You might try raising the shower onto a platform, allowing enough height to plumb the new drain onto the old (I've had to do this once), or if that is not an option, I think I'd recommend either learning to use a masonry saw to cut out the concrete, or maybe learn how to do tile. I've done tile for quite a while, and it's really not that hard. Your local building store can give you plenty of advice, and provide you with all the materials you'll need (Lowe's Home Depot. etc.) :�)

: I have an existing cast Iron floor drain set in concrete. The drain is about 3" offset from where the new fiberglass insert fits. What do I need to do to move the drain? The other option is to retile an existing wall. Avoiding tile work is the main reason I got a shower insert.